Holding that an "advice of counsel" defense to willful infringement does not waive the attorney-client privilege as to trial counsel partly because post-filing conduct is usually not relevant to a finding of willful infringement
Holding that “obviousness is determined entirely with reference to a hypothetical ‘person having ordinary skill in the art’ ” and the “actual inventor's skill is irrelevant” to the obviousness inquiry
Holding that a royalty needs to be only reasonable and that the "task [of determining a reasonable royalty] is simplified when the record shows an established royalty for the patent in question or for related patents or products"
Holding that "[t]he answer is `no'" to the question of whether "the existence of a substantial defense to infringement [is] sufficient to defeat liability for willful infringement even if no legal advice has been secured"
Holding that "[v]iewed individually, the specific examples of vexatious conduct recited by the district court [were] somewhat tenuous," but "when viewed together, we cannot say that the district court's finding of vexatious litigation was clearly erroneous"